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/* -*- Mode: C; tab-width: 4 -*- */
/* forest --- binary trees in a fractal forest */
#if !defined( lint ) && !defined( SABER )
static const char sccsid[] = "@(#)forest.c 5.00 2000/11/01 xlockmore";
#endif
/*-
* Copyright (c) 1995 Pascal Pensa <pensa@aurora.unice.fr>
*
* Original idea : Guillaume Ramey <ramey@aurora.unice.fr>
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation.
*
* This file is provided AS IS with no warranties of any kind. The author
* shall have no liability with respect to the infringement of copyrights,
* trade secrets or any patents by this file or any part thereof. In no
* event will the author be liable for any lost revenue or profits or
* other special, indirect and consequential damages.
*
* Revision History:
* 01-Nov-2000: Allocation checks
* 10-May-1997: Compatible with xscreensaver
*
*/
#ifdef STANDALONE
#define MODE_forest
#define PROGCLASS "Forest"
#define HACK_INIT init_forest
#define HACK_DRAW draw_forest
#define forest_opts xlockmore_opts
#define DEFAULTS "*delay: 400000 \n" \
"*count: 100 \n" \
"*cycles: 200 \n" \
"*ncolors: 100 \n"
#define UNIFORM_COLORS
#include "xlockmore.h" /* in xscreensaver distribution */
#else /* STANDALONE */
#include "xlock.h" /* in xlockmore distribution */
#endif /* STANDALONE */
#ifdef MODE_forest
ModeSpecOpt forest_opts =
{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
#ifdef USE_MODULES
ModStruct forest_description =
{"forest", "init_forest", "draw_forest", "release_forest",
"refresh_forest", "init_forest", (char *) NULL, &forest_opts,
400000, 100, 200, 1, 64, 1.0, "",
"Shows binary trees of a fractal forest", 0, NULL};
#endif
#define MINTREES 1
#define MINHEIGHT 20 /* Tree height range */
#define MAXHEIGHT 40
#define MINANGLE 15 /* (degree) angle between soon */
#define MAXANGLE 35
#define RANDANGLE 15 /* (degree) Max random angle from default */
#define REDUCE 90 /* Height % from father */
#define ITERLEVEL 10 /* Tree iteration */
#define COLORSPEED 2 /* Color increment */
/* degree to radian */
#define DEGTORAD(x) (((float)(x)) * M_PI / 180.0)
#define RANGE_RAND(min,max) ((min) + NRAND((max) - (min)))
typedef struct {
int width;
int height;
int time; /* up time */
int ntrees;
} foreststruct;
static foreststruct *forests = (foreststruct *) NULL;
static void
draw_tree(ModeInfo * mi,
short int x, short int y, short int len,
float a, float as, short int c, short int level)
/* Father's end */
/* Length */
/* color */
/* Height level */
/* Father's angle */
/* Father's angle step */
{
Display *display = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
GC gc = MI_GC(mi);
short x_1, y_1, x_2, y_2;
float a1, a2;
/* left */
a1 = a + as + DEGTORAD(NRAND(2 * RANDANGLE) - RANDANGLE);
x_1 = x + (short) (COSF(a1) * ((float) len));
y_1 = y + (short) (SINF(a1) * ((float) len));
/* right */
a2 = a - as + DEGTORAD(NRAND(2 * RANDANGLE) - RANDANGLE);
x_2 = x + (short) (COSF(a2) * ((float) len));
y_2 = y + (short) (SINF(a2) * ((float) len));
if (MI_NPIXELS(mi) > 2) {
XSetForeground(display, gc, MI_PIXEL(mi, c));
c = (c + COLORSPEED) % MI_NPIXELS(mi);
} else
XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
XDrawLine(display, window, gc, x, y, x_1, y_1);
XDrawLine(display, window, gc, x, y, x_2, y_2);
if (level < 2) {
XDrawLine(display, window, gc, x + 1, y, x_1 + 1, y_1);
XDrawLine(display, window, gc, x + 1, y, x_2 + 1, y_2);
}
len = (len * REDUCE * 10) / 1000;
if (level < ITERLEVEL) {
draw_tree(mi, x_1, y_1, len, a1, as, c, level + 1);
draw_tree(mi, x_2, y_2, len, a2, as, c, level + 1);
}
}
void
init_forest(ModeInfo * mi)
{
foreststruct *fp;
if (forests == NULL) {
if ((forests = (foreststruct *) calloc(MI_NUM_SCREENS(mi),
sizeof (foreststruct))) == NULL)
return;
}
fp = &forests[MI_SCREEN(mi)];
fp->width = MI_WIDTH(mi);
fp->height = MI_HEIGHT(mi);
fp->time = 0;
fp->ntrees = MI_COUNT(mi);
if (fp->ntrees < -MINTREES)
fp->ntrees = NRAND(-fp->ntrees - MINTREES + 1) + MINTREES;
else if (fp->ntrees < MINTREES)
fp->ntrees = MINTREES;
MI_CLEARWINDOW(mi);
}
void
draw_forest(ModeInfo * mi)
{
Display *display = MI_DISPLAY(mi);
GC gc = MI_GC(mi);
short x, y, x_2, y_2, len, c = 0;
float a, as;
foreststruct *fp;
if (forests == NULL)
return;
fp = &forests[MI_SCREEN(mi)];
MI_IS_DRAWN(mi) = True;
if (fp->time < fp->ntrees) {
x = RANGE_RAND(0, fp->width);
y = RANGE_RAND(0, fp->height + MAXHEIGHT);
a = -M_PI / 2.0 + DEGTORAD(NRAND(2 * RANDANGLE) - RANDANGLE);
as = DEGTORAD(RANGE_RAND(MINANGLE, MAXANGLE));
len = ((RANGE_RAND(MINHEIGHT, MAXHEIGHT) * (fp->width / 20)) / 50) + 2;
if (MI_NPIXELS(mi) > 2) {
c = NRAND(MI_NPIXELS(mi));
XSetForeground(display, gc, MI_PIXEL(mi, c));
c = (c + COLORSPEED) % MI_NPIXELS(mi);
} else
XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
x_2 = x + (short) (COSF(a) * ((float) len));
y_2 = y + (short) (SINF(a) * ((float) len));
XDrawLine(display, MI_WINDOW(mi), gc, x, y, x_2, y_2);
XDrawLine(display, MI_WINDOW(mi), gc, x + 1, y, x_2 + 1, y_2);
draw_tree(mi, x_2, y_2, (len * REDUCE) / 100, a, as, c, 1);
}
if (++fp->time > MI_CYCLES(mi)) {
init_forest(mi);
}
}
void
release_forest(ModeInfo * mi)
{
if (forests != NULL) {
free(forests);
forests = (foreststruct *) NULL;
}
}
void
refresh_forest(ModeInfo * mi)
{
MI_CLEARWINDOW(mi);
}
#endif /* MODE_forest */
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